EE 230 Lecture 35 Spring 2010

EE 230 Lecture 35 Spring 2010 - EE 230 Lecture 35 Data...

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EE 230 Lecture 35 Data Converters
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Determine the ratio of the small-signal transconductance of a BJT to that of a MOSFET is both are biased at a quiescent current of 1mA. Assume uC OX =1E-4A/V 2 , V T =1V, W=10u, L=8u, λ =0, J A =1E-15, β =100, A E =100u 2 and V AF = . Quiz 35
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And the number is ? 1 3 8 4 6 7 5 2 9 ?
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Determine the ratio of the small-signal transconductance of a BJT to that of a MOSFET is both are biased at a quiescent current of 1mA. Assume uC OX =1E-4A/V 2 , V T =1V, W=10u, L=8, λ =0, J A =1E-15, β =100, A E =100u 2 and V AF = . Quiz 35 DQ GSQ T 2I V- V m g = CQ t I V m g = CQ GSQ T t DQ t GSQ T I V V 2I 2V V mB mM g g ==
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Determine the ratio of the small-signal transconductance of a BJT to that of a MOSFET is both are biased at a quiescent current of 1mA. Assume uC OX =1E-4A/V 2 , V T =1V, W=10u, L=8u, λ =0, J A =1E-15, β =100, A E =100u 2 and V AF = . Quiz 35 GSQ T t V- V 2V mB mM g g = () 2 OX DQ GSQ T μ CW I= V - V 2L 2 GSQ T 1E-4 10 1mA= V -V 28 GSQ T V = 4 4 80 22 5 GSQ T t V 2V mB mM g V gm V == =
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Small Signal-Large Signal Model of MOSFET in Saturation Region DQ I O g λ () OX GSQ T W μ CV V L m g =− OX GSQ T W μ V L m g Summary 2 OX GSQ T W μ V 2L Large Signal Model for Q-Point Calculations Small Signal Model Simplified Basic Model Review from Last Time:
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Small signal analysis example Consider again: OUT Vm IN V A gR V == 2 DQ m GSQ T I g VV = but thus [] DQ v SS T 2I R A = + V GSQ = -V SS DQ v SS T 2I R A = + The gain expressions appear to be different !
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This note was uploaded on 02/01/2012 for the course EE 230 taught by Professor Mina during the Fall '08 term at Iowa State.

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EE 230 Lecture 35 Spring 2010 - EE 230 Lecture 35 Data...

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